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Open Source and information security mailing list archives
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Date: Thu, 26 Jul 2007 17:57:36 +0100 (BST) From: Hugh Dickins <hugh@...itas.com> To: Roland McGrath <roland@...hat.com> cc: Andrew Morton <akpm@...ux-foundation.org>, Linus Torvalds <torvalds@...ux-foundation.org>, linux-kernel@...r.kernel.org, "Kawai, Hidehiro" <hidehiro.kawai.ez@...achi.com> Subject: Re: [PATCH] ELF core dump options On Thu, 26 Jul 2007, Roland McGrath wrote: > > > hm, I'm now wondering whether testing i_nlink was the best (or official) > > way of determining whether a MAP_SHARED vma is anonymous or file-backed. > > Hugh will know. > > Well, it doesn't exactly test that it's not "file-backed". (Technically > anything shared is file-backed, even if by a shmem virtual file.) It tests > whether the backing file will probably ever be found on disk later. That > gets shmem regions as well as originally-regular files that were deleted > while mapped. I think we asked around when this test was put it and it was > deemed proper at the time. (It doesn't really need to be a formal "what > does the vm situation mean" guarantee, just a practical "you probably > wanted that" test.) Exactly, a rough heuristic which seemed to approximate what the coredump people wanted when it went into 2.6.12. No absolute justification to it. Hugh - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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